Second that request for the pre course phys programme. Can get (Regular) JI's off ArmyNet but they don't have the suggested phys (Annex F) attached. If you consider it more appropriate feel free to PM me.

Go for long walks in boots and and carrying a ruc-sac with weight in it. Practise it when tired, early in the morning, midday, and at night.
Then do some running, in Boots and carrying a ruc-sac with weight in it.

But seriously, if you are going on the course that starts at the end of May, you need to have started training last week. You need to be able to pass an 8 mile CFT comfortably, forget about MATTS you are training to be a leader of men and lead by example. Forget the gym queen stuff, get that bergan on, and get out there. I'm aware the course has changed slightly since I did it last but be prepared for an intense time. The first week concluded with a three day ex which essentially revolved around a series of Pl attacks (and consequent casevacs!), it finished with the CFT (which at the time was only four miles - I am led to believe this is now at least 6, if not 8??) I had to take out the spare tin of 200 7.62 from my jetpacks to bring my weight down to the 25kg.

Not trying to boast - but be prepared to be lugging some weight around. A lot of the lads thought that because they could do a PFT in 8 minutes then they could cope with crawling 400 metres through a stream to get to the fire support position - Combat fitness is something completely different.